Displacement method is applicable to determine the focal length of convex lens. In this method, the applicable formula is f= (D^(2) - X^(2) )/( 4D). Here D= distance between object plane and screen on which image is formed f= focal length of lens, X= distance between two position of lens. To determine focal length of lens, the measure value of D and x are 90.0cm and 30.0cm, respectively. If percentage error in measurement of focal length is n xx 10^(-1)%. Find the value of n.

Displacement method is applicable to determine the focal length of con

1.	Displacement method is applicable to determine the focal length of convex lens. In this method, the applicable formula is f= (D^(2) - X^(2) )/( 4D). Here D= distance between object plane and screen on which image is formed f= focal length of lens, X= distance between two position of lens. To determine focal length of lens, the measure value of D and x are 90.0cm and 30.0cm, respectively. If percentage error in measurement of focal length is n xx 10^(-1)%. Find the value of n.
Answer» `40 CM` `10 cm` `30 cm` `20 cm` ANSWER :D

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